When I visited their headquarters yesterday, they gave me a 2003 product guide. Under their Ultra Sc, SSc, Rc (for supercharged cars)
they list the following:
Maxima: 95-01 3.0L DOHC (Stock Diameter) Part# 121001002
Maxima: 02-03 3.5L DOHC (Stock Diameter) Part# 121011002

 

That's confirmed. I just got off the phone with UR and 121001002 is the correct part number for 2K-2K1 Maxima stock diameter pulleys. So I guess that begs the question. How much of the hp increase on a lightened, underdrive pulley is due to the reduction in weight and how much is due to underdriving the accessories?

 

based on their number and numbers i've read on other sites...80% of power is "brought back" (remember, never an increase, just a release of already existing HP) through simple weight reduction. another site mentioned 2-3HP is gained per pound of reduction.

i don't know where the accessories tie in under this but i would understand that it's not really a big increase as it's just not letting the pulley rotate as much as it used to, make sense? and under that understanding, i don't see a HUGE power difference. i'd say it's more weight reduction than anything.

 

Cool. Thanks.

 

Unorthodox claims a gain of 5 to 12 HP and 4 to 8 lbs-ft on normally aspirated engines...on average. From the lighter weight pulley they claim 2.7HP is gained from every pound lost at the crank. Using this claim, the pulley I got weighs about 1.5 pounds and the OEM about 4.5 pounds; a reduction of 3 pounds. Multiply that by 2.7 and you get 8.1 HP gained.
They further claim that 85% of the gains are from the weight loss. The remainging 15% from underdriving.......